fix(@angular/cli): use parsed package name for migrate-only updates

[alan-agius4]

This change updates the update command to use the parsed package name from npm-package-arg instead of the raw input string when performing a 'migrate-only' update. This ensures that package identifiers are correctly and consistently handled.

[gemini-code-assist]

Code Review

The pull request correctly updates the update command to use the parsed package name from npm-package-arg when performing a 'migrate-only' update. This ensures that the migrateOnly function receives the correct package identifier, improving the robustness and consistency of the update process. The previous implementation could have passed an unparsed package string or an undefined value, which is now resolved by using the name property from the npa.Result object.

[alan-agius4]

This PR was merged into the repository. The changes were merged into the following branches:

• main: c9f07db
• 21.2.x: 1505164

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